http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Journal of periodontology (1970 : Online)
Official publication of the American Academy of Periodontology.
Journal of periodontology-periodontics (Online)
American Academy of Periodontology, 737 N. Michigan Ave., Ste. 800, Chicago, IL 60611